ON Broadway, they’re angels – Glinda the Good Witch of “Wicked” and Belle of “Beauty and the Beast.” No wonder Kate Reinders and Sarah Litzsinger like to blow off a little steam now and then and act, well, slutty.

The actresses and real-life best friends debut tonight as TastiSkank, billed as “the smokin’ love child of the Indigo Girls and Tenacious D.” Clad in wifebeaters, miniskirts and pink high heels, they’ll sing songs they’ve penned themselves (often in bars, before shows) like “We Don’t Do Threesomes” and “I [LOVE] Dirty Boys With No Money.”

“All our songs are taken from life,” says Reinders, who, like Litzsinger, is a 5-foot-2, blue-eyed blonde. But titles can be deceiving: Their love song “In and Out” is really an ode to the L.A. burger joint.

Don’t be surprised if their castmates from “Wicked” and “B&B” turn up to see them. “Just don’t expect show tunes!” Reinders says.